Detail

Layout is similar to DrawingArea in that it's a "blank slate" and
doesn't do anything but paint a blank background by default. It's different
in that it supports scrolling natively (you can add it to a
ScrolledWindow), and it can contain child widgets, since it's a
Container. However if you're just going to draw, a DrawingArea is a
better choice since it has lower overhead.

This function should only be called after the layout has been placed in a
ScrolledWindow or otherwise configured for scrolling. It returns the
Adjustment used for communication between the horizontal scrollbar and
layout.

This function should only be called after the layout has been placed in a
ScrolledWindow or otherwise configured for scrolling. It returns the
Adjustment used for communication between the vertical scrollbar and
layout.